It's possible to argue that "swallow" describes a diametrically opposed action, but it isn't really an antonym. Retching is such an unusual condition that an antonym describing the state of not retching is not be particularly useful, so we haven't developed one.
Accidentally switching the television to Rosie O'Donnell caused me to retch.
wretch
At its strongest it means something which will make you retch and vomit. Generally it is used for things which do not actually make a person retch and vomit, but are of that nature.
SketchSketchLetchwretchSketch and Retch
Hurl - 2008 Merry-Go-Retch 1-7 was released on: USA: 24 August 2008
The grisly scene made the newbie retch.
By licking, or "bathing" themselves, they pick up loose fur, then retch.
Synonyms for vomiting include upchuck, spew, retch, heave, and gag.
There are many different words one might use to replace the term 'retch.' Popular word choices include hurl, throw up, vomit, and puke, as well as expletive terms.
The antonym of the word 'synonym' is 'antonym'.
Yes. "Wretch" is a person, but "retch" is a verb meaning "to vomit."
An antonym means "opposite". So an antonym for the word synonym is antonym.